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Updates to Snake2 #136

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BartDeWaal wants to merge 2 commits into from
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Updates to Snake2 #136

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c80a73a
Snake2 l0dable: Prevent candy from loading outside playing field.
BartDeWaal Dec 28, 2015
6a38e78
Make it possible to quit by holding enter button down for one second.
BartDeWaal Dec 28, 2015
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32 changes: 29 additions & 3 deletions l0dables/snake2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include <r0ketlib/print.h>
#include <r0ketlib/keyin.h>
#include <r0ketlib/itoa.h>
#include <rad1olib/systick.h>

#include "invfont.c"

Expand All @@ -36,6 +37,9 @@
#define UP 3
#define DOWN 1

//define how long you have to hold down the button to quit
#define QUIT_DELAY 1000

struct pos_s {
int x,y;
};
Expand All @@ -48,7 +52,7 @@ struct snake_s {
static void reset();
static void next_level();
static void draw_block();
static void handle_input();
static int handle_input();
static void death_anim();
static struct pos_s getFood(void);
static int hitWall();
Expand All @@ -73,7 +77,9 @@ void ram(void)
while (1)
{
if(!(++c % snake.speed)) {
handle_input();
if (handle_input()){ //handle_input returns 1 to quit
break;
}

pos = (snake.t_start+1) % MAX_SNAKE_LEN;
snake.tail[pos].x = snake.tail[snake.t_start].x;
Expand Down Expand Up @@ -145,6 +151,15 @@ static struct pos_s getFood(void)
goto tryagain;
}

// make sure new food is in playing field
// Quick and dirty, but it works.
if ((res.x*SNAKE_DIM <= MIN_X) ||
(res.x*SNAKE_DIM >= MAX_X) ||
(res.y*SNAKE_DIM <= MIN_Y) ||
(res.y*SNAKE_DIM >= MAX_Y)) {
goto tryagain;
}

return res;
}

Expand Down Expand Up @@ -218,9 +233,10 @@ static void next_level()
DoString(0,0,IntToStr(++points,6,0));
}

static void handle_input()
static int handle_input()
{
int key = getInputRaw(), dir_old = snake.dir;
static int quitWhen = 0;

if (key&BTN_UP && dir_old != 1)
snake.dir = 3;
Expand All @@ -230,6 +246,16 @@ static void handle_input()
snake.dir = 2;
else if (key&BTN_RIGHT && dir_old !=2)
snake.dir = 0;
else if (key&BTN_ENTER) {
if (quitWhen == 0){
quitWhen = _timectr + QUIT_DELAY/SYSTICKSPEED;
} else if (_timectr > quitWhen) {
return 1; //indicate program should quit
}
return 0;
}
quitWhen = 0;
return 0; // program should continue running
}

static int hitSelf()
Expand Down